Specifying constants and default values

Constants

Constants should be specified outside a class or struct in the header file with the following naming convention.

...
#include "some_include.h"

namespace yourNamespace {
// Constants should be prefixed with a k and written in camelCase.
static constexpr double kSomeConstant = 0.00135;
...
struct SomeStruct {};
class SomeClass {};
...
}

Default Values

Default values should be constructed of constants initialized in the constructor as follows.

...
#include "some_include.h"

namespace yourNamespace {
// Constants should be prefixed with a k and written in camelCase.
static constexpr double kSomeConstant = 0.001;
// Default values should be prefixed with kDefault and also written in camelCase.
static constexpr double kDefaultYourVariableName = 0.002;
...
class SomeClass {
  double your_variable_name_;
  ...
 public:
  // Member initialization with default values.
  SomeClass() 
      : your_variable_name_(kDefaultYourVariableName), 
        ... {}
  ...
};
...
}